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| 型号： | LT3641EFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 28-TSSOP |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 可调至 1.265V，可调至 0.6V |
| 输入电压： | 2.5 V ~ 42 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 500kHz ~ 2MHz |
| 电流 - 输出： | 1.3A，1.1A |
| 同步整流器： | 两者兼有 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
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LT3641
APPLICATIONS INFORMATION
where V OUT1 is high voltage channel output voltage, V D is
Table 2. Inductor Vendors
the forward voltage drop of the catch diode, and f S is the
switching frequency. For example, 3.3μH is a reasonable
inductance for a 3.3V output with 2MHz switching
frequency.
Once the inductance is selected, the inductor current ripple
and peak current can be calculated:
VENDOR
Murata
TDK
TOKO
Sumida
Cooper/Coiltronics
WEBSITE
www.murata.com
www.tdk.com
www.toko.com
www.sumida.com
www.cooperindustries.com
? ? 1 – OUT1
Δ I L1 =
(V OUT1 + V D ) ? V + V D ?
?
L1 ? f S ? V IN ?
Coilcraft
Vishay
NIC
www.coilcraft.com
www.vishay.com
www.niccomp.com
I L(PEAK) = I OUT(MAX) +
Δ I L
2
Würth Elektronik www.we-online.com
Of course, such a simple design guide will not always
To guarantee suf?cient output current, peak inductor
current must be lower than the switch current limit (I LIM ).
The largest inductor current ripple occurs at the highest
V IN . To guarantee current capacity, use V IN(MAX) in the
above formula.
The inductance for the low voltage channel is:
result in the optimum inductors for the applications. A
larger value inductor provides a slightly higher maximum
load current and will reduce the output voltage ripple. A
larger value inductor also results in higher ef?ciency in the
condition of same DCR and same magnetic loss. However,
for a same series of inductors, a larger value inductor has
higher DCR. The trade-off between inductance and DCR
L2 = 1.5
V OUT2
f S
is not always obvious. Use experiments to ?nd optimum
inductors.
For a selected inductance, the inductor current ripple can
be calculated:
Low inductance may result in discontinuous mode oper-
ation, which is okay, but reduces maximum load current.
For details of maximum output current and discontinuous
? ? 1 – OUT2 ?
Δ I L2 =
V OUT2
L2 ? f S
? V ?
? V IN2 ?
mode operation, see the Linear Technology Application Note
44. For duty cycles greater than 50%, there is a minimum
inductance required to avoid subharmonic oscillations.
For robust operation in fault conditions, the inductor
saturation current should be higher than the upper limit
of the corresponding top switch current limit.
To keep the ef?ciency high, the inductor series resistance
(DCR) should be as small as possible (must be < 0.1Ω),
and the core material should be intended for the chosen
operation frequency. High ef?ciency converters generally
cannot afford the core loss found in low cost powdered
See the Linear Technology Application Note 19.
Input Capacitor
Bypass the V IN pin of the LT3641 with a ceramic capacitor
of X7R (–55°C to 125°C) or X5R (–55°C to 85°C) type.
Buck converters draw pulse current from the input supply.
The input capacitor is required to reduce the resulting
voltage ripple. Use a ceramic capacitor with:
iron cores; instead use ferrite, molypermalloy or Kool Mμ
cores. Table 2 lists several vendors and suitable inductor
series.
C IN ≥
10μF
f S
where f S in the switching frequency in MHz.
3641fa
14
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| LT3641EUFD#PBF | 功能描述:IC REG BUCK SYNC ADJ DL 28QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT3641EUFD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ DL 28QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
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